JP2528511Y2 - Mold for resin molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to the removal and removal of a passage component in a resin molding die having a pin gate.

[Related Art] A sleep rate type having a stripper plate on a fixed side is frequently used as a resin molding die having a pin gate of this type. In this sleep rate type, since the mold is first opened between the stripper plate and the fixed mold plate, the passage component is held on the fixed mold plate side by the lock of the runner lock pin on the runner portion on the pin gate extension line. As a result, the pin gate component is cut off. In this case, the runner component is held on the stripper plate side. Next, since the mold is opened between the stripper plate and the fixed-side mounting plate to unlock the runner lock pin, the runner component is peeled off from the stripper plate side and then removed.

[Problem to be Solved by the Invention] The above described sleep rate type requires a mold configuration such as a puller bolt, a runner lock pin, and a support pin in addition to the stripper plate, and the mold structure becomes large and complicated. Was inevitable.

The locking force involved in peeling and removing the passage portion product depends on the molding conditions and the like of the resin material, but such consideration has not been given to existing runner lock pins.

Thus, the present invention has been developed to solve the above-mentioned disadvantages, and provides a resin molding die that simplifies the die structure and allows the pin gate part product to be reliably cut and removed. Is the purpose.

[Means for Solving the Problems] In the resin molding die according to the present invention for achieving the above object, a resin passage portion is provided between a fixed mounting plate and a fixed mold plate so as to be openable, The fixed-side mounting plate has a configuration in which a lock member that is larger than the cutting force of the pin gate part component and smaller than the sprue lock force when opening the mold faces the resin passage near the extension of the pin gate.

[Operation] As the mold opening of the fixed-side mounting plate and the fixed mold plate starts, the locking member locks on the resin passage portion, so that the passage component near the extension of the pin gate is locked to the fixed-side mounting plate side. Then, the pin gate component is cut. In this state, the passage portion product is locked by the sprue lock pin.

With the opening of the mold, the passage portion product is locked by the sprue lock pin near the extension of the pin gate, and becomes in a state of being pulled. As the mold is opened, the passage component is separated from the lock member and is held by the sprue lock pin having a large locking force. After that, the sprue lock pin is released, and the passage component is removed.

Embodiment FIGS. 1 to 6 show an embodiment of a resin molding die according to the present invention.

In the figure, 1 is a fixed mounting plate, 2 is a fixed mold, 3 is a movable plate, 4 is a spacer block, 5 is a movable mounting plate, 6 is a sprue lock pin, 7 is a sprue, 8 is a pin gate, and 9 is a cavity. It is.

The fixed mounting plate 1 and the fixed mold plate 2 are formed on a parting surface P1 which can be opened. The mounting plate 1 and the mold plate 2 serve as a resin passage portion connected to the sprue 7 and the pin gate 8. A runner 10 is provided. The runner 10 is preferably provided on the fixed mounting plate 1. In the runner 10,
A lock member 11 is provided near an extension of the pin gate 7.

As the lock member 11, a claw member can be used. In this case, the claw portion 12 projects from the runner 10 by a desired amount in the flow direction of the runner 10, can be smaller than the width of the runner 10, and is fixed to the fixed side mounting plate 1 by the fixing portion 13. The fixing portion 13 is formed with an elongated hole 14 having an adjustable protrusion amount, and can be fixed with a bolt 16. The claw portion 12 is formed with a tapered portion 15 and this tapered surface 15 is fixed to the fixed side mounting plate 1.
The lock release can be easily configured by turning to.

Further, a through hole 18 is provided in the hole 17 of the sprue lock pin 6.
The through hole 18 can be provided with a valve 19 and a pump 20.

According to the above configuration, as shown in FIG. 1, when the molten resin is injected and filled, since the claw member 1 protrudes from the runner component 10a in the runner 10, the protrusion amount of the claw portion 12 is reduced. Biting has occurred accordingly. Of course, the sprue lock pin 6 is also locked to the runner component 10a.

Next, as shown in FIG. 4, the mold opening between the fixed-side mounting plate 1 and the fixed mold plate 2 starts. However, in the runner component 10a, the locking force by the claw portion 12 is exerted. The pin gate part product 8a on this extension line is cut, and a peeled state is formed in the pin gate. Since the runner component 10a is locked by, for example, the sprue lock pin 6 at the central portion, the sprue component 7a is peeled off from the sprue 7 and exhibits a slightly bent state as a whole.

As shown in FIG. 5, since the runner part product 10a is locked by the claw part 12 and the sprue lock pin 6, the runner part 10a is more likely to be pulled and bent as the mold is opened. In such a state, the runner component 10a is
The lock is released by the guide of the tapered surface 15 of FIG.

Further, as shown in FIG. 6, the sprue lock pin 6 may be retracted to unlock and protrude. For example, when air from the pump 20 is supplied to the hole 17 through the through hole 18 via the valve 19, the runner component 10a is blown off and removed. Although not shown, the fixed template 2
The parting surface P2 of the movable mold plate 3 and the movable mold plate 3 is opened, and the cavity part molded product 9a is projected.

In the above embodiment, the claw member is exemplified as the lock member 11, but the present invention is not limited to this, and an undercut provided on the fixed-side mounting plate 1 can be implemented as the lock member. Further, the lock member can be implemented in different mold structures, and the amount of protrusion can be easily adjusted appropriately along the elongated hole 14 according to the resin material, molding conditions, and the like. Other design changes are possible. Further, the tapered surface 15 of the lock member 11 is an example, and another uneven shape or the like can be selected as the lock surface.

[Effects] As described above, the resin molding die according to the present invention is:
A resin passage is provided between the fixed side mounting plate and the fixed mold plate so that the mold can be opened.The sprue lock provided on the fixed mold plate is larger than the cutting force of the pin gate part component when the mold is opened on the solid side mounting plate. Since the lock member having a lock force smaller than the sprue lock force of the pin is made to face the resin passage near the extension of the pin gate, the stripper plate in the conventional sleep rate type and the related die structure are not required. Thus, the peeling and removal could be performed by using the bouncing of the passage part product.

[Brief description of the drawings]

The drawings show one embodiment of the resin molding die according to the present invention,
1 is an overall sectional view, FIG. 2 is an enlarged sectional view of a claw member portion, FIG. 3 is an enlarged perspective view of a claw member, FIG. 4 is a sectional view showing a gate cut, and FIG. FIG. 6 is a sectional view showing unlocking, and FIG. 6 is a sectional view showing releasing of sprue lock. DESCRIPTION OF SYMBOLS 1 ... Fixed side mounting plate, 2 ... Fixed type plate, 3 ... Movable type plate, 6 ... Sprue lock pin, 7 ... Sprue, 8 ... Pin gate, 10 ... Resin passage part, 11 ... Lock Members, 12 ...
... claw part, 14 ... long hole, 15 ... taper surface, 18 ... through hole.

Claims (2)

(57) [Scope of request for utility model registration] 1. A resin passage portion is provided between a fixed-side mounting plate and a fixed mold plate so as to be mold-openable. The fixed-side mounting plate has a force greater than a cutting force of a pin gate component when the mold is opened. A resin molding die in which a lock member having a lock force smaller than a sprue lock force of a sprue lock pin provided on a plate faces a resin passage near an extension of a pin gate. 2. The resin molding die according to claim 1, wherein the locking member is capable of adjusting a locking force.